Question Vertical lines on VA monitor, gray background, 60Hz & 75Hz

[Zvonkoo]

Hello. I have a problem with my monitor. Few days ago I was going through display settings and I saw my refresh rate was set to 60Hz, even though it's always set to 75Hz, so I set it to 75Hz it and discovered some vertical lines, predominantly visible on grayish background (Discord). I reverted back to 60Hz and they are less visible and less strong (I haven't even noticed them till now).

My monitor is AOC Q3279VWF from 2017.
- Diagonal: 31.5"
- Resolution 2560x1440
- Refresh rate: 75Hz
- Panel type: MVA (LC320HU1A panel model)
- Panel bit depth: 10 bits (8 bits + FRC)
- Backlight: W-LED

I've connected my monitor to another output and its the same, so I guess its not the GPU. I have also tried DP and HDMI on GPU its the same. I have newest GPU drivers.

What is this issue and how its called? Is it fixable?
Why is it more stronger @75Hz?
Why is it mostly visible on gray background? (Can't see nothing on white, but darker colors like blue, purple, brown I can)
And lastly, my monitor was always set to 75Hz, this change happened without my notice.

 

[kanewolf]

Hello. I have a problem with my monitor. Few days ago I was going through display settings and I saw my refresh rate was set to 60Hz, even though it's always set to 75Hz, so I set it to 75Hz it and discovered some vertical lines, predominantly visible on grayish background (Discord). I reverted back to 60Hz and they are less visible and less strong (I haven't even noticed them till now).

My monitor is AOC Q3279VWF from 2017.
- Diagonal: 31.5"
- Resolution 2560x1440
- Refresh rate: 75Hz
- Panel type: MVA (LC320HU1A panel model)
- Panel bit depth: 10 bits (8 bits + FRC)
- Backlight: W-LED

I've connected my monitor to another output and its the same, so I guess its not the GPU. I have also tried DP and HDMI on GPU its the same. I have newest GPU drivers.

What is this issue and how its called? Is it fixable?
Why is it more stronger @75Hz?
Why is it mostly visible on gray background? (Can't see nothing on white, but darker colors like blue, purple, brown I can)
And lastly, my monitor was always set to 75Hz, this change happened without my notice.

Could be the fake 10bit color depth. Maybe try disabling HDR in windows.

 

[Zvonkoo]

Could be the fake 10bit color depth. Maybe try disabling HDR in windows.

Its not supported, it can't be turned on.

 

[SyCoREAPER]

Could be the fake 10bit color depth. Maybe try disabling HDR in windows.

It is, OPs monitor is 8bit+frc which means basically simulated/fake 10bit. If it's requesting a 10bit color signal it might be struggling. Banding is a trade characteristic of FRC though not typically limited to one color though.



There's a tool i think it was called Custom Resolution by Toasty. Otherwise only thing I can think of is to install all that AOC Menu bloat and see if there's a setting in there.